はじめに

Python でのデータインポート入門

Hugo Bowne-Anderson

Data Scientist at DataCamp

データのインポート

フラットファイル、例：.txt、.csv
他のソフトウェアからのファイル

ch_1_1_v2.004.png

データのインポート

フラットファイル、例: .txt、.csv
他のソフトウェアからのファイル
リレーショナルデータベース

ch_1_1_v2.005.png

プレーンテキストファイル

ch_1_1_v2.007.png

テーブルデータ

titanic.csv

                        Name      Sex  Cabin  Survived
     Braund, Mr. Owen Harris     male    NaN         0
  Cumings, Mrs. John Bradley   female    C85         1
      Heikkinen, Miss. Laina   female    NaN         1
Futrelle, Mrs. Jacques Heath   female   C123         1
    Allen, Mr. William Henry     male    NaN         0

¹ 出典： Kaggle

テーブルデータ

titanic.csv

titanic.csv with a row highlighted

テーブルデータ

titanic.csv

titanic.csv with a column highlighted

フラットファイル

テキストファイルの読み込み

filename = 'huck_finn.txt'

file = open(filename, mode='r')  # 'r' is to read

text = file.read()

file.close()

テキストファイルの表示

print(text)

YOU don't know about me without you have read a book by
the name of The Adventures of Tom Sawyer; but that 
ain't no matter. That book was made by Mr. Mark Twain,
and he told the truth, mainly. There was things which 
he stretched, but mainly he told the truth.  That is 
nothing. never seen anybody but lied one time or 
another, without it was Aunt Polly, or the widow, or 
maybe Mary. Aunt Polly--Tom's Aunt Polly, she is--and
Mary, and the Widow Douglas is all told about in that
book, which is mostly a true book, with some 
stretchers, as I said before.

ファイルの書き込み

filename = 'huck_finn.txt'
file = open(filename, mode='w')  # 'w' is to write
file.close()

コンテキストマネージャー with

with open('huck_finn.txt', 'r') as file:
    print(file.read())

YOU don't know about me without you have read a book by
the name of The Adventures of Tom Sawyer; but that 
ain't no matter. That book was made by Mr. Mark Twain,
and he told the truth, mainly. There was things which 
he stretched, but mainly he told the truth.  That is 
nothing. never seen anybody but lied one time or 
another, without it was Aunt Polly, or the widow, or 
maybe Mary. Aunt Polly--Tom's Aunt Polly, she is--and 
Mary, and the Widow Douglas is all told about in that 
book, which is mostly a true book, with some 
stretchers, as I said before.

演習で行う内容:

ファイルをコンソールに表示する
特定の行を表示
フラットファイル

練習しましょう！

Python でのデータインポート入門